Pump and Treat
- Groundwater is extracted using 11 wells at an average total pumping rate of 175 gpm in the upper aquifer and 25 gpm in the lower aquifer
- Extracted groundwater is treated with an electrochemical system for removal of heavy metals, and air stripping and granular activated carbon for removal of organics
- Treated groundwater is reinjected through infiltration trenches and galleries
- ROD Date: 09/09/90
|EPA Point of Contact:|
Jon Gorin, RPM
U.S. EPA Region 2
290 Broadway, 19th Floor
New York, NY 10007-1866
|Additional Point of Contact:|
2001 Nolte Drive
West Deptford, NJ 08066
Chlorinated solvents, BTEX, Heavy metals
- Contaminants of concern include 1,1-DCA, trans-1,2-DCE, 1,1,1-TCA, TCE, PCA, PCE, benzene, toluene, ethylbenzene, beryllium, chromium, copper, and nickel
- Maximum initial concentrations included PCE (2,500 mcg/L), trans-1,2-DCE (12 mcg/L), 1,1,1-TCA (2,200 mcg/L), and chromium (1,040 mcg/L)
Discharge of waste to surface impoundment/lagoon; unauthorized dumping
Type/Quantity of Media Treated:
- 151.5 million gallons treated as of December 1997
- Groundwater is found at 15-35 ft bgs (shallow aquifer) and from 50-250 ft bgs (deep aquifer)
- Extraction wells are located in two aquifers
- Hydraulic conductivity ranges from 55 to 100 ft/day
Purpose/Significance of Application:
Treatment system consists of a treatment train designed for removal of metals and organics
Regulatory Requirements/Cleanup Goals:
- The remedial goal for the site is to reduce contaminant concentrations to below maximum contaminant levels (MCLs) set by the New Jersey Safe Drinking Water Act and the primary drinking water standards. Cleanup goals were established for beryllium (4 mcg/L), cadmium (10 mcg/L), chromium (50 mcg/L), copper (1,000 mcg/L), mercury (2 mcg/L), nickel (210 mcg/L), zinc (5,000 mcg/L), 1,1-DCA (2 mcg/L), trans-1,2-DCE (10 mcg/L), 1,1,1-TCA (26 mcg/L), TCE (1 mcg/L), PCA (1.4 mcg/L), PCE (1 mcg/L), benzene (1 mcg/L), toluene (2,000 mcg/L), and ethylbenzene (50 mc g/L).
- The extraction system was designed to create an inward hydraulic gradient to contain the plume.
- Cleanup goals for metals and VOCs have been met in the deep aquifer and for all but some wells in the shallow aquifer (two for VOCs and four for metals). Groundwater monitoring data indicate that the plume appears to have been contained.
- From March 1995 through December 1997, the treatment system removed 1,510 pounds of organics and 3,910 pounds of metals, for a total mass removal of 5,420 pounds.
Actual costs for pump and treat were approximately $2,816,000 ($2,031,000 in capital and $785,000 in O&M), which correspond to $19 per 1,000 gallons of groundwater extracted and $520 per pound of contaminant removed.
The King of Prussia Technical Corporation operated as a waste disposal and recycling facility from January 1971 until early 1974, with six lagoons used to process industrial waste. EPA estimates that the company processed at least 15 million gallons of acid and alkaline wastes at this site. Drums of VOCs were buried at the site. In addition, trash and hazardous waste are suspected to have been dumped at the site illegally between 1976 and 1988 after the company stopped operations. Soil and groundwater contamination were detected by the state in 1976, and the site was added to the NPL in September 1983. A ROD was issued for this site in September 1990.
Groundwater is extracted at this site using six wells in the shallow aquifer and five wells in the deep aquifer. Extracted groundwater is treated with an electrochemical system for removal of heavy metals, and air stripping and granular activated carbon for removal of organics. Treated groundwater is reinjected through infiltration trenches and galleries. Cleanup goals for metals and VOCs have been met in the deep aquifer and for all but some wells in the shallow aquifer. As of December 1997, groundwater elevations have achieved steady-state under the current pumping scheme. The groundwater flow and contaminant transport will be reevaluated using models to evaluate remediation enhancements, including adding or removing extraction wells. In addition, the site operator is considering pumping changes.